.sidebar{width:var(--sidebar-width);min-width:var(--sidebar-width);height:100%;background:var(--bg-sidebar);border-right:1px solid var(--border-color);display:flex;flex-direction:column;transition:width .2s ease,min-width .2s ease;overflow:hidden}.sidebar.collapsed{width:var(--sidebar-collapsed);min-width:var(--sidebar-collapsed)}.sidebar-header{display:flex;align-items:center;justify-content:space-between;padding:42px 12px 8px;border-bottom:1px solid var(--border-color);-webkit-app-region:drag}.sidebar-header>*{-webkit-app-region:no-drag}.sidebar-title{font-size:16px;font-weight:700;background:linear-gradient(135deg,var(--accent-blue),var(--accent-purple));-webkit-background-clip:text;-webkit-text-fill-color:transparent;white-space:nowrap}.sidebar-toggle{width:28px;height:28px;display:flex;align-items:center;justify-content:center;border-radius:var(--radius-sm);font-size:10px;color:var(--text-muted);transition:background .15s}.sidebar-toggle:hover{background:var(--bg-card);color:var(--text-primary)}.connection-status{display:flex;align-items:center;gap:8px;padding:10px 16px;border-bottom:1px solid var(--border-color)}.status-dot{width:8px;height:8px;border-radius:50%;flex-shrink:0}.status-dot.connected{background:var(--accent-green);box-shadow:0 0 6px var(--accent-green)}.status-dot.disconnected{background:var(--accent-red)}.status-text{font-size:12px;color:var(--text-secondary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.level-nav{flex:1;overflow-y:auto;padding:8px;display:flex;flex-direction:column;gap:2px}.level-group{margin-bottom:4px}.group-header{display:flex;align-items:center;gap:6px;width:100%;padding:6px 12px;font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.05em;color:var(--text-muted);border-radius:var(--radius-sm);transition:background .15s,color .15s}.group-header:hover{background:var(--bg-card);color:var(--text-secondary)}.group-header.group-completed{color:var(--accent-green)}.group-header.group-active{color:var(--text-secondary)}.group-chevron{font-size:10px;flex-shrink:0;width:12px;text-align:center}.group-name{flex:1;text-align:left}.group-progress{font-size:10px;color:var(--text-muted);font-weight:500}.level-item{display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:var(--radius);transition:background .15s;text-align:left;width:100%}.level-item:hover:not(:disabled){background:var(--bg-card)}.level-item.active{background:var(--bg-card);border-left:3px solid var(--accent-blue)}.level-item:disabled{opacity:.4;cursor:not-allowed}.level-icon{font-size:20px;flex-shrink:0;width:28px;text-align:center}.level-info{flex:1;min-width:0;display:flex;flex-direction:column}.level-number{font-size:10px;text-transform:uppercase;letter-spacing:.05em;color:var(--text-muted)}.level-name{font-size:13px;font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.level-locked .level-name{color:var(--text-muted)}.level-available .level-name{color:var(--text-primary)}.level-active .level-name{color:var(--accent-blue)}.level-completed .level-name{color:var(--accent-green)}.level-badge-area{display:flex;align-items:center;flex-shrink:0}.badge-earned{font-size:16px}.step-progress{font-size:11px;color:var(--accent-blue);font-weight:600}.sidebar-footer{padding:12px 16px;border-top:1px solid var(--border-color)}.progress-bar{height:4px;background:var(--bg-card);border-radius:2px;overflow:hidden;margin-bottom:6px}.progress-fill{height:100%;background:linear-gradient(90deg,var(--accent-blue),var(--accent-green));border-radius:2px;transition:width .3s ease}.progress-text{font-size:11px;color:var(--text-muted);display:block;margin-bottom:8px}.settings-btn{width:100%;padding:8px;font-size:12px;color:var(--text-secondary);border:1px solid var(--border-color);border-radius:var(--radius-sm);transition:all .15s}.settings-btn:hover{background:var(--bg-card);color:var(--text-primary)}.app-shell{display:flex;height:100vh;width:100vw;overflow:hidden}.main-content{flex:1;overflow-y:auto;padding:24px 32px;background:var(--bg-primary)}.onboarding{height:100vh;width:100vw;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--bg-primary) 0%,var(--bg-secondary) 100%)}.onboarding-card{background:var(--bg-card);border:1px solid var(--border-color);border-radius:16px;padding:48px;text-align:center;max-width:480px;width:90%}.onboarding-title{font-size:32px;font-weight:800;background:linear-gradient(135deg,var(--accent-blue),var(--accent-purple));-webkit-background-clip:text;-webkit-text-fill-color:transparent;margin-bottom:8px}.onboarding-subtitle{color:var(--text-secondary);font-size:16px;margin-bottom:36px}.onboarding-step h2{font-size:20px;margin-bottom:20px}.onboarding-input{width:100%;padding:14px 16px;font-size:16px;border:1px solid var(--border-color);border-radius:var(--radius);background:var(--bg-secondary);color:var(--text-primary);outline:none;margin-bottom:16px;transition:border-color .15s}.onboarding-input:focus{border-color:var(--accent-blue)}.onboarding-btn{padding:12px 32px;font-size:16px;font-weight:600;background:linear-gradient(135deg,var(--accent-blue),var(--accent-purple));color:#fff;border-radius:var(--radius);transition:opacity 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20px;display:flex;align-items:center;justify-content:space-between;margin-bottom:24px}.banner-text{color:var(--accent-orange);font-size:14px}.banner-btn{padding:8px 20px;font-size:13px;font-weight:600;background:var(--accent-orange);color:var(--bg-primary);border-radius:var(--radius-sm);transition:opacity .15s}.banner-btn:hover{opacity:.85}.continue-btn{width:100%;padding:20px;font-size:18px;font-weight:600;background:linear-gradient(135deg,var(--accent-blue),var(--accent-purple));color:#fff;border-radius:12px;margin-bottom:32px;transition:opacity .15s}.continue-btn:hover{opacity:.9}.badge-shelf h2{font-size:18px;margin-bottom:16px}.badge-groups{display:flex;flex-direction:column;gap:20px}.badge-group-title{font-size:13px;font-weight:600;text-transform:uppercase;letter-spacing:.05em;color:var(--text-muted);margin-bottom:10px}.badges{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.continue-btn:disabled{opacity:.4;cursor:not-allowed}.badge-slot{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius);padding:20px;text-align:center;opacity:.4;transition:all .2s}.badge-slot.earned{opacity:1;border-color:var(--badge-gold)}.badge-icon{font-size:32px;margin-bottom:8px}.badge-label{font-size:12px;font-weight:600;color:var(--text-secondary)}.badge-slot.earned .badge-label{color:var(--badge-gold)}.step-nav{display:flex;align-items:center;justify-content:space-between;padding:16px 0;margin-top:24px;border-top:1px solid var(--border-color)}.step-nav-btn{padding:10px 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var(--border-color);border-radius:var(--radius);overflow:hidden;margin-bottom:16px}.card-header{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;border-bottom:1px solid var(--border-color)}.card-title{font-size:15px;font-weight:600}.detail-toggle{display:flex;gap:2px;background:var(--bg-primary);border-radius:var(--radius-sm);padding:2px}.toggle-btn{padding:4px 12px;font-size:11px;font-weight:500;border-radius:3px;color:var(--text-muted);transition:all .15s}.toggle-btn.active{background:var(--accent-blue);color:#fff}.toggle-btn:hover:not(.active){color:var(--text-primary)}.card-body{padding:16px;font-size:14px;line-height:1.6;color:var(--text-secondary)}.card-body p{margin-bottom:12px}.card-body p:last-child{margin-bottom:0}.card-body strong{color:var(--text-primary)}.card-body code{background:var(--bg-primary);padding:2px 6px;border-radius:3px;font-size:12px;color:var(--accent-blue)}.sorting-exercise{display:flex;flex-direction:column;gap:1.25rem;width:100%}.sorting-unsorted{background:var(--bg-secondary, #1a1a2e);border:2px dashed var(--border-color, #2a2a45);border-radius:var(--radius, 8px);padding:1rem;min-height:80px;transition:border-color .2s,background .2s}.sorting-unsorted:hover,.sorting-unsorted:has(.sorting-item:hover){border-color:var(--accent-blue, #4fc3f7)}.sorting-unsorted--empty{opacity:.6}.sorting-unsorted-label{font-size:.75rem;font-weight:600;text-transform:uppercase;letter-spacing:.05em;color:var(--text-muted, #6b6b80);margin-bottom:.5rem}.sorting-unsorted-items{display:flex;flex-wrap:wrap;gap:.5rem;min-height:36px;align-items:center}.sorting-unsorted-hint{font-size:.8rem;color:var(--text-muted, #6b6b80);font-style:italic}.sorting-buckets{display:flex;gap:1rem;flex-wrap:wrap}.sorting-bucket{flex:1;min-width:140px;background:var(--bg-card, #252540);border:2px solid color-mix(in 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#e0e0e0)}.placeholder-content{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:.75rem;padding:3rem 2rem;border:2px dashed var(--border-color, #444);border-radius:12px;text-align:center;background:var(--surface-secondary, rgba(255, 255, 255, .03))}.placeholder-content p{margin:0;color:var(--text-secondary, #aaa);font-size:1rem;line-height:1.5}.placeholder-content .step-description{font-style:italic;color:var(--text-tertiary, #888);font-size:.9rem}.placeholder-content .coming-soon-icon{font-size:2.5rem;margin-bottom:.5rem;opacity:.6}.ascii-encoder{margin-top:12px}.ascii-encoder input{width:100%;padding:10px 14px;font-size:16px;font-family:SF Mono,Fira Code,monospace;background:var(--terminal-bg);border:1px solid var(--border-color);border-radius:var(--radius);color:var(--text-primary);outline:none;transition:border-color .2s}.ascii-encoder input:focus{border-color:var(--accent-blue)}.ascii-encoder 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var(--border-color);border-radius:var(--radius);color:var(--text-primary);outline:none;resize:vertical;min-height:72px;transition:border-color .2s}.word-encoder textarea:focus{border-color:var(--accent-green)}.word-encoder textarea::placeholder{color:var(--text-muted)}.token-chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px;min-height:52px}.token-chip{display:flex;flex-direction:column;align-items:center;border-radius:var(--radius-sm);overflow:hidden;border:1px solid;transition:transform .15s ease}.token-chip:hover{transform:translateY(-2px)}.token-word{padding:5px 12px;font-size:14px;font-weight:600;color:var(--text-primary)}.token-id{padding:3px 12px 5px;font-size:12px;font-weight:500;font-family:SF Mono,Fira Code,monospace}.word-empty{color:var(--text-muted);font-size:13px;margin-top:12px;font-style:italic}.number-line-section{margin-top:12px}.number-line-label{font-size:13px;color:var(--text-muted);margin-bottom:8px}.number-line-svg{width:100%;max-width:640px;display:block;margin:0 auto}.number-line-note{font-size:13px;color:var(--text-muted);margin-top:12px;text-align:center;font-style:italic;line-height:1.5}.number-line-insight{margin-top:16px;padding:12px 16px;background:var(--bg-secondary);border-left:3px solid var(--accent-yellow);border-radius:0 var(--radius-sm) var(--radius-sm) 0;font-size:13px;color:var(--text-secondary);line-height:1.6}.number-line-insight strong{color:var(--accent-yellow)}.code-block{background:var(--terminal-bg);border:1px solid var(--border-color);border-radius:var(--radius);overflow:hidden;margin-bottom:16px}.code-header{padding:6px 12px;background:var(--bg-card);border-bottom:1px solid var(--border-color)}.code-lang{font-size:11px;color:var(--text-muted);text-transform:uppercase;letter-spacing:.05em}.code-content{padding:12px 16px;overflow-x:auto;font-size:13px;line-height:1.5;color:var(--text-primary)}/**
 * Copyright (c) 2014 The xterm.js authors. All rights reserved.
 * Copyright (c) 2012-2013, Christopher Jeffrey (MIT License)
 * https://github.com/chjj/term.js
 * @license MIT
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * Originally forked from (with the author's permission):
 *   Fabrice Bellard's javascript vt100 for jslinux:
 *   http://bellard.org/jslinux/
 *   Copyright (c) 2011 Fabrice Bellard
 *   The original design remains. The terminal itself
 *   has been extended to include xterm CSI codes, among
 *   other features.
 */.xterm{cursor:text;position:relative;user-select:none;-ms-user-select:none;-webkit-user-select:none}.xterm.focus,.xterm:focus{outline:none}.xterm .xterm-helpers{position:absolute;top:0;z-index:5}.xterm .xterm-helper-textarea{padding:0;border:0;margin:0;position:absolute;opacity:0;left:-9999em;top:0;width:0;height:0;z-index:-5;white-space:nowrap;overflow:hidden;resize:none}.xterm .composition-view{background:#000;color:#fff;display:none;position:absolute;white-space:nowrap;z-index:1}.xterm .composition-view.active{display:block}.xterm .xterm-viewport{background-color:#000;overflow-y:scroll;cursor:default;position:absolute;right:0;left:0;top:0;bottom:0}.xterm .xterm-screen{position:relative}.xterm .xterm-screen canvas{position:absolute;left:0;top:0}.xterm-char-measure-element{display:inline-block;visibility:hidden;position:absolute;top:0;left:-9999em;line-height:normal}.xterm.enable-mouse-events{cursor:default}.xterm.xterm-cursor-pointer,.xterm 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